Surface energy and stress driven growth of extremely long and high-density ZnO nanowires using a thermal step-oxidation process.

Formation of highly crystalline zinc oxide (ZnO) nanowires with an extremely high aspect ratio (length = 60 μm, diameter = 50 nm) is routinely achieved by introducing an intermediate step-oxidation method during the thermal oxidation process of thin zinc (Zn) films. High-purity Zn was deposited onto clean glass substrates at room temperature using a vacuum-assisted thermal evaporation technique. Afterwards, the as-deposited Zn layers were thermally oxidized under a closed air ambient condition at different temperatures and durations.

Slow spin dynamics of cluster spin-glass spinel Zn(Fe1-xRu)O: role of Jahn-Teller active spin-1/2 Cuions at B-sites.

We report the slow spin dynamics of cluster spin-glass (SG) spinel Zn(Fe1-xRu)Oby means of detaileddc-magnetization andac-susceptibility studies combined with the heat capacity analysis. Two specific compositions ( = 0.5, 0.

Antiferromagnetism, spin-glass state, H-T phase diagram, and inverse magnetocaloric effect in CoRuO.

Static and dynamic magnetic properties of normal spinel CoRuO= (Co)A[Co3+Ru3+]BO4are reported based on our investigations of the temperature (), magnetic field () and frequency () dependence of the ac-magnetic susceptibilities and dc-magnetization () covering the temperature range= 2 K-400 K and H up to 90 kOe. These investigations show that CoRuOexhibits an antiferromagnetic (AFM) transition at∼ 15.2 K, along with a spin-glass state at slightly lower temperature () near 14.